Charles Darwin supposed that evolution involved a process of gradual change, generated randomly, with the selection and retention over many generations of survival-promoting features. Some theists have never accepted this idea.'Intelligent design' is a relatively recent theory, supposedly based on scientific evidence, which attempts to refute Darwin's ideas. But neither its basic claim of'irreducible complexity', nor its supposition that nature shows universal evidence of'intelligent design', can be supported by scientific evidence. For that reason it should not form a part of the science curriculum in any school.